A pony bottle is a smaller tank, which is carried in addition to the main tank. It possesses its own regulator with first and second stage and sometimes a separate pressure gauge. It will is mounted either at ones side or in front of the body or fixed to the main tank. A pony bottle scuba tank is the only true redundant breathing mechanism you can completely rely on.
Nitrox ready up to 40%
Most Reliable Redundant Air Source
Aluminum Alloy Design
Working Pressure: 3000 psi (200 bar)